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Anyone in Virginia know the exact rule for aftermarket exhausts? Is any aftermarket exhaust illegal or is it based on loudness? I was told by the nice officer that, "if it's louder than the stock exhaust, it's illegal". How do they know how loud the stock exhaust is for every make and model car? Do they have this on record? I would have thought the law would be based on a single set SPL covering all cars. Also, does this differ from county to county or is it the same statewide?

I do know the noise ordinances are set to a specific SPL regardless of the source of the noise, but what I'm wondering is more related to the legality of particular aftermarket exhausts that are not necessarily breaking the noise ordinance level.
 

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